2 files changed, 27 insertions, 5 deletions
diff --git a/formats/packfile/delta.go b/formats/packfile/delta.go
index 95c13d5..d08f969 100644
--- a/formats/packfile/delta.go
+++ b/formats/packfile/delta.go
@@ -1,6 +1,10 @@
 package packfile
 
-import "gopkg.in/src-d/go-git.v4/core"
+import (
+	"io/ioutil"
+
+	"gopkg.in/src-d/go-git.v4/core"
+)
 
 // See https://github.com/git/git/blob/49fa3dc76179e04b0833542fa52d0f287a4955ac/delta.h
 // https://github.com/git/git/blob/c2c5f6b1e479f2c38e0e01345350620944e3527f/patch-delta.c,
@@ -11,12 +15,21 @@ const deltaSizeMin = 4
 
 // ApplyDelta writes to taget the result of applying the modification deltas in delta to base.
 func ApplyDelta(target, base core.Object, delta []byte) error {
-	src := base.Content()
+	r, err := base.Reader()
+	if err != nil {
+		return err
+	}
+
 	w, err := target.Writer()
 	if err != nil {
 		return err
 	}
 
+	src, err := ioutil.ReadAll(r)
+	if err != nil {
+		return err
+	}
+
 	dst := PatchDelta(src, delta)
 	target.SetSize(int64(len(dst)))
 
diff --git a/formats/packfile/parser_test.go b/formats/packfile/parser_test.go
index 5d41d69..f4aff83 100644
--- a/formats/packfile/parser_test.go
+++ b/formats/packfile/parser_test.go
@@ -240,7 +240,10 @@ func (s *ParserSuite) TestReadNonDeltaObjectContent(c *C) {
 		obj := &core.MemoryObject{}
 		err = p.FillFromNonDeltaContent(obj)
 		c.Assert(err, IsNil, com)
-		c.Assert(obj.Content(), DeepEquals, test.expected, com)
+
+		r, _ := obj.Reader()
+		bytes, _ := ioutil.ReadAll(r)
+		c.Assert(bytes, DeepEquals, test.expected, com)
 	}
 }
 
@@ -297,7 +300,10 @@ func (s *ParserSuite) TestFillOFSDeltaObjectContent(c *C) {
 		err = p.FillOFSDeltaObjectContent(obj, test.offset)
 		c.Assert(err, IsNil, com)
 		c.Assert(obj.Type(), Equals, test.expType, com)
-		c.Assert(obj.Content(), DeepEquals, test.expContent, com)
+
+		r, _ := obj.Reader()
+		bytes, _ := ioutil.ReadAll(r)
+		c.Assert(bytes, DeepEquals, test.expContent, com)
 	}
 }
 
@@ -361,7 +367,10 @@ func (s *ParserSuite) TestFillREFDeltaObjectContent(c *C) {
 		err = p.FillREFDeltaObjectContent(obj)
 		c.Assert(err, IsNil, com)
 		c.Assert(obj.Type(), Equals, test.expType, com)
-		c.Assert(obj.Content(), DeepEquals, test.expContent, com)
+
+		r, _ := obj.Reader()
+		bytes, _ := ioutil.ReadAll(r)
+		c.Assert(bytes, DeepEquals, test.expContent, com)
 
 		p.ForgetAll()
 	}